package test;

/**
 * 问输出什么?
 */
public class Demo13 {
    public static void main(String[] args) {
        String s = "A";
        StringBuilder ss = new StringBuilder(s);
        test(s,ss);
        System.out.println(s+ss);
    }
    private static void test(String s,StringBuilder ss){
        s+="A";
        ss.append("A");
    }
}
